Geodesic
Adjoining zero to ordered groupoid-semigroups
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (2003), pp. 28-35.

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N. Kehayopulu; M. Tsingelis. Adjoining zero to ordered groupoid-semigroups. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (2003), pp. 28-35. http://geodesic.mathdoc.fr/item/IVM_2003_9_a5/

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[4] Kehayopulu N., Tsingelis M., “Characterizations of $0$-simple ordered semigroups”, Sci. Math., 3:2 (2000), 311–314 | MR

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[6] Kehayopulu N., “On intra-regular ordered semigroups”, Semigroup Forum, 46 (1993), 271–278 | DOI | MR | Zbl